<html><body><pre>
<?   
print_r($GLOBALS);
?>
<hr>
With a querystring:
<a href="globals.php?query_key=querey value">Querystring</a>

And a post request:
<form action="globals.php" method="post" name="formb" id="formb">
<input type="Text" name="aField" value="Hallo Welt">
<input type="Submit">
</form>
</pre></body></html>